An SUV stopped on a freeway overpass was launched over a guardrail and onto Interstate 19 after being rear-ended by another vehicle early Friday in a three-vehicle wreck south of Tucson, officials say.

The driver of a southbound vehicle on I-19 swerved into the median to avoid the SUV, said L.T. Pratt, a spokesman for the Green Valley Fire District.

Two people were taken to Banner-University Medical Center with injuries that were not life-threatening, he said. A third driver was treated at the scene.

Green Valley Fire District crews from two stations went to the crash site at Continental Road, said Pratt.

The Arizona Department of Public Safety is handling the investigation, Pratt said.